Avoid having backend-only code compiled into ecpg. Per Zdenek Kotala

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 462227dc007d7fa002eca38c010d95d458fa1aef
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-10-26T14:17:53Z
Releases: 8.3.0
Avoid having backend-only code compiled into ecpg.  Per Zdenek Kotala

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